Strainer attachment



9, 1954 F. w. WAHLlN STRAINER ATTACHMENT Filed July 14, 1949 INVENTOR.

' Patented Feb. 9, 1954 STRAINER ATTACHMENT FiejliWI Wahlin;ak'"1ark,'I1l2, assignorto-Spray ingisystems cm; 'Belh'vood; I115, a-corporation* Application July-14 194.9, .SerialiNo. 104,671

My invention relates to a straining-or filtering attachment for-pipes and. hoses-and has more particular reference to a strainer of this =ch'aracter which is small enough in size tobe insertable through the bung-hole...oi an -.oil drum .or the like and which-has-a large, reinforced straining area withanintake enclosed thereby, and located near the base-ofthestrainer.

This: strainer attachment is, adapted for use with hosesfand pipessuch as are used in removing liquids.- from oil drums.tanks,.barrels,,and the like Liquids such astoil for example which. have stoodsforsometime inadrum or tanhmay contain sediment-or (other foreignmatter which should be strained out-as the liquid is removed.

' Various types 'of strainers are availahlefor this purpose but usually.- they; have either a minimum of straining.- area. whichbecomes clogged with sedimentafter brief" use, vthus necessitating fre- '.quent-cleaning, or, ifthey-ahave more straining area, their intakes are so: high-above the bottom of the-tank or drum from whichthe liquid is to be extracted,- that -they.do-not remove the liquid .near the bottom.

In order to overcomeathelimitations vfound in the usual strainer, I have invented a strainer attachment which provides anenlarged-straining area-andi-whichat the same time has iitsxintake at the lowest level-within the strainer enclosure.

It is the object of my; invention to. design a straining attachment which-will withdraw liquid substantially to-the: bottom i of a barrel or drum; to provide a convenient strainer assemblytrain which the straining element "may be readily re- :movedand replaced;, to retain such straining or filtering element in the desired shape by means ofiinter'naIreinforcing; to provide external protection for said straining element to prevent dislocation or damage thereto; to supply convenient external mea'nsiforrscraping the outer surface of the straining.- elementin. ordertoremove foreign matter therefrom; and to provide simple, economiea-liand convenient facilities Which are-read- 'ily attachable to the intake-end of any ordinary pipe orlhose;.theseandotherobjects being accomplisheda's-hereinatterdescribed; referencefbeing had to the accompanying.drawingv in which Fig: 1 is' aside view with p'ortions broken away showing a strainer attachment embodying my invention, I

Fig. 2 isa sectional viewon the 1in'e2-2l of Fig. 1,

Fig. 3 is a sectionalwiewofl 'ig; -2,

FigA-is a side view of a liquid containingdrum with aiportion broken away 'toshow my strainer attachment at the lower. end of (a. pipe, and

Fig; .5 is a View similar to Fig. abut showing my strainer invention attachment atthe lower end of a flexible hose.

Referring now to the drawing, my strainer 2 attachment is designated generally; by; therefor enc'e numeral IWandmay "be attached either to a hose H as shown in Figs: 1' ,andi5 "or, ,to-apipe It a-s'shown' in Fig; 4. The strainer attachment 1 0 consists of atubular corei3 with'an attachin head. "ltwhichis' internally threaded for 4 attachmentto a" standard hose'fitting 'liior to .the simii larly' threaded end of "at length" of: pipe; I 27'; The exterior of the attaching head. It is" hexagonal in shape for engagement by wrenches; The interior of the attachingjhead. i4 is provided :with.a washer I16 of rubber. or other suitable material which is seated at the upper end ofrthe tubular core." l3 and is engageable between the tubular core- I 3' and the'hose, fitting litoprovide aleakproof assembly.

The opposite endofthe'tubularwm ;l3"is internally threaded to receive the cap. ,IT, The said cap ILis provided with'a per'ipheralseat l'tjand anannular shell 1:9 supliiorted on the attaching head Id at the opposite .end of the tubular. core I3 is provided with a corresponding, neripheral seat 20.

The straining. element comprises a tubular screen 2,! which is of" substantially the. same length as thetubular core I13" andistengaged'endwise between the attaching, head. Miand'theicap H. The tubular, screen 2| is internally rein.- forced by a helical spring ..'22 the outer: diameter of which. is substantially the same.,as the inner diameter of the. tubular screen. 21' so. that-the latter. will fit snu ly over the said .helicalspring 122'. The respective ends ofithe helicalspring '22 are engaged in' the same :manner as the tubular screen?! ,,between the attaching head 'I "4 :Land the cap H;

The exterior of the tubular'screen .21 is protected by a helical spring-guard 2,3; the pitch of which-'is'opposite to that ofthe helical springf'2'2. 'I'heinn'erdiameter of the guard 23 is substantially the same-as the outer-diameter of the tubular screen 2|, so that the said guard 23* will-"fit snugly over'thetubula-r screen 2'']. 'Therespec- 'tiveends-of the guard '23 are engaged by -the respective peripheral seats 'l 8--and""2U*. The-re spective -ends rmay, however, be disenga'gedfrom therespe'ctive seats by grasping the' s-pring' guard 23 at either end and compressing said spring guard in the opposite direction. Inthis--manner theconvolutions of"thespringguardWW-serve to scrap-'thewuter"surface ofthe tubular screen 21'.

The tubular core" .l3'. is 'provided 'with intake ports 24 :at thelowerend thereof; as 'shownin Fig; 1'. Thusi'when the strainer attachment Iii is attachedto a pipe [2, as" shown in "Fig. 4,:the intake portsZ'fare atthe lower end oflthestrainer attachment so that withdrawing'fljuidl 1mm .a. steer drum.'25,, for example, theliquid w ill'oom tinue to be withdrawn through the tubular core throughout most of the length ofthe strainer attachment l0 until the liquid level reaches the top of the intake ports 24. Moreover, to remove additional liquid, the drum may be tilted so that the liquid accumulates around the strainer attachment l0, thus enabling removal of most of the liquid in said drum 25.

In a similar manner the strainer attachment l0 may be mounted at the end of a length of hose I and inserted into a similar steel drum 25 through the bung-hole thereof, and owing to the flexibility of the hose 1 the strainer attachment I0 may lie on the bottom of the said drum. In the same manner as heretofore described, liquid may be withdrawn from the steel drum until the liquid level is lowered to the level of the intake ports 24. Where a hose is used for withdrawing the liquid, the drum 25 may be tilted so that the intake ports 25 will be submerged, permitting liquid withdrawal until substantially all of the liquid has been withdrawn.

If the liquid contains a substantial amount of sediment or other foreign matter, the tubular screen 2| may become clogged thereby. In this foreign matter therefrom. The screen and the strainer attachment may then be reinserted into the drum 25 to continue the process of withdrawing the liquid contained therein.

When the tubular screen 2| becomes clogged with sediment or other foreign matter, there is a tendency for the screen to become collapsed, owing to the reduced pressure on the inner sides thereof, but the inner helical spring 22 provides reinforcement against such collapse.

The tubular screen 2| is protected against damage resulting from careless handling by the helical spring guard 23 surrounding the exterior of the tubular screen 2|.

When it is desired to replace the straining element, the cap I! is unscrewed from the end of the tubular core I 3 thus permitting convenient removal of the tubular screen 2| and the helical springs 22 and 23. A new tubular screen 2| may then be slid over the inner helical spring 22 and the outer helical spring guard 23 may be engaged thereon and the said tubular screen and spring assembly may then be mounted on the tubular core I3 and secured in position by screwing the cap I! into place at the end thereof. It will be understood, of course, that the tubular screen 2| will be of any desired mesh in order to strain or filter out sediment or other foreign matter of a pre-determined size.

While I'have shown and described my invention in a preferred form, I am aware that various changes or modifications may be made therein without departing from the principles of my invention, the scope of which is to be determined by the appended claims.

What is claimed is: v I 1. A strainer head comprising an elongated tubular screen and an elongated screen holder extending lengthwise within the screen and having opposed annular seats in which the opposite ends of the screen are secured, said holder having at one end thereof a screen closing member which closes one end of the screen and said holder having an opening leading therefrom at the other end of the screen and communicating with the interior of the screen, an open coil screen cleaning spring surrounding and extend- 4 ing from end to end of the screen and having the convolutions thereof spaced apart and each freely slidable lengthwise of the screen along the outer surface thereof in scraping engagement therewith, said spring being exposed and free to be grasped manually for reciprocation lengthwise of the screen, and abutments at the opposite ends extension.

Number of the screen and against which the opposite ends of the spring abut to confine the spring endwise at the location of the screen, the spring ends being freely retractable along the screen from their respective abutments, and an elongated open coil spring within and internally supporting the screen throughout the length of the latter, the pitch of said internally supporting spring being opposite to that of the aforesaid screen surrounding spring.

2. A strainer head comprising an elongated cylindrical screen, and a screen holder having an elongated tubular extension within and spaced from the screen and extending lengthwise thereof, said extension being open at one end and provided around that end with an annular seat in which one end of the screen is secured, and a cap detachably secured to and closing the other end of said extension and having an annular seat therearound in which the other end of the screen is secured, an open coil screen cleaning spring surrounding and extending from end to end of the screen and having the convolutions thereof spaced apart and each freely slidable lengthwise of the screen along the outer surface thereof in scraping engagement therewith, said spring being exposed and free to be grasped manually for reciprocation lengthwise of the screen, and abutments at the opposite ends of the screen and against which the opposite ends of the spring abut to confine the spring endwise at the location of the screen, the spring ends being freely retractable along the screen from their respective abutments, and an elongated open coil spring within and internally supporting the screen throughout the length of the latter, the pitch of said internally supporting spring being opposite to that of the aforesaid screen surrounding spring, said screen and tubular extension having an annular chamber therebetween which extends lengthwise thereof, said extension having at the closed end thereof openings through the wall thereof through which said annular chamber is exclusively communicable with the interior of the FRED W. WAI-ILIN.

References Cited in the file of this patent UNITED STATES PATENTS Name. Date 217,126 Loudon July 1, 1879 231,066 Long Aug. 10, 1880 679,131 Thompson July 23, 1901 900,104 Kessler Oct. 6, 1908 1,090,387 Davidson Mar. 17, 1914 1,116,234 Brown Nov. 3, 1914 1,928,049 Danills Sept. 26,1933 2,186,440 Williams Jan; 9, 1 940 FOREIGN PATENTS Number Country Date 8,808 Great Britain Apr. 18, 1903 169,591 Great Britain Oct. 6, 1921 658,237 France of 1929 759,090 France 'Nov. .16, 1933 

